LVD after charging with generator

Just used my backup Iota 45 DLS charger for the first time. The batteries were down to 60% and no sun on the horizon so I rolled out the generator and plugged in the charger. In a little less then 2 hrs the batteries were back to 90%. When I returned two days later, after a sunny day, the batteries were still at 90%. I checked the control panel and saw that the charge controller was blinking red, indicating a low voltage disconnect (LVD). I rebooted the system and all is fine now. Can anyone explain why using the Iota charger would trigger the PV charge controller to LVD ? The Iota is hardwired to the battery bank.

Morning Star Prostar 30. Definitely LVD, the red light was blinking. The HVD is supposed to automatically reconnect, the LVD at 12.6 volts. The Trimetric showed 90% and SG was okay so the batteries were not discharged, certainly not to the LVD level which is 11.4 volts. Charge controller is only a few years old,

I'll check the connections. The generator was outside and not near the charge controller. The Trimetric meter showed a normal charging curve from 60% to 90%, starting at about 13.6 volts, increasing to 15 volts at 90% when I was using the charger. I had the IOTA set on the fast charge cycle in order to match my battery specs, including the specs for an equalizing charge. Even if the LVD was real, it should have reset once the input voltage reached 12.6, which it surely did with full sun the following day (or second day?). There was limited sun yesterday but the SOC reached 95%. Wish I was out there today to see if anything has changed. Inverter was off the entire time.

Bill - Just to be clear, the LVD function of the charge controller disconnects only the load terminals on the controller that power DC loads. The LVD does not disconnect the battery bank from the inverter if the voltage level drops below a certain set point. To protect the battery bank from being drained, maybe completely discharged, if the inverter is accidentally left on would require a voltage controlled switch entirely separate from the charge controller. If this is correct, I've been confused about the LVD function of a charge controller as, I think, have others.

That standard inverter shutdown voltage is ~10.5 volts (for a 12 volt battery). That low of bus voltage can be damaging to the battery bank... And the inverter shutdown voltage is there to primarily protect the inverter. Remember that Power=Voltage*Current... As the voltage falls, the current must rise to support a given load--The input current can overheat the inverter's input circuitry (Power=I^2*R heating).

Also, I believe that inverters will "brown out" the AC loads (AC voltage falls out of regulation) at or below battery cutoff voltage.

Lead acid batteries contain almost no usable energy at 10.5 volts--It is a good voltage to use anyways. The MorningStar 300 Watt TSW 12 volt inverter, as I recall, can be programmed for 11.5 volt shutdown--Which can help prevent battery damage from "too deep" discharge.